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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Cash flows from operating activities:    
Net income $ 85,485 $ 81,752
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 27,451 24,247
Allowance for doubtful accounts 184 (99)
Impairment of long-lived assets   8,771
Stock-based compensation 9,920 11,028
Excess benefits from stock-based compensation (5,293) (1,104)
Gain on sale of property and equipment (183) (963)
Deferred incomes taxes (6,986) (9,068)
Changes in operating assets and liabilities:    
Accounts receivable (59,165) (29,549)
Vehicle pooling costs (4,325) 268
Inventories (2,535) 498
Prepaid expenses and other current assets (3,529) 5,933
Other assets (7,014) 247
Accounts payable and accrued liabilities 18,695 (5,431)
Deferred revenue (28) 697
Income taxes receivable (4,776) 3,281
Income taxes payable 4,918 (12)
Other liabilities 271 (148)
Net cash provided by operating activities 53,090 90,348
Cash flows from investing activities:    
Purchases of property and equipment (85,682) (14,875)
Proceeds from sale of property and equipment 990 761
Proceeds from sale of assets held for sale 861  
Purchases of assets and liabilities in connection with acquisitions, net of cash acquired (31,243) (180)
Net cash used in investing activities (115,074) (14,294)
Cash flows from financing activities:    
Proceeds from the exercise of stock options 16,358 6,335
Excess tax benefit from stock-based payment compensation 5,293 1,104
Proceeds from the issuance of Employee Stock Purchase Plan shares 951 1,019
Repurchases of common stock (14,512) (135,395)
Proceeds from the issuance of long-term debt   125,000
Debt offering costs   (313)
Principal payments on long-term debt (37,505) (18,750)
Net cash used in financing activities (29,415) (21,000)
Effect of foreign currency translation 797 (1,423)
Net (decrease) increase in cash and cash equivalents (90,602) 53,631
Cash and cash equivalents at beginning of period 140,112 74,009
Cash and cash equivalents at end of period 49,510 127,640
Supplemental disclosure of cash flow information:    
Interest paid 5,220 5,221
Income taxes paid $ 55,874 $ 50,019